[3] [3] Chen C H, Lin C H, Yang Y S, et al. J Chem. Phys. C, 2016, 120: 5783.

[4] [4] Li Y, Liu Z H, Lu X X, et al. Nanoscale, 2015, 7: 1601.

[5] [5] Priolo F, Gregorkiewicz T, Galli M, et al. Nature Nanotech., 2014, 9: 19.

[6] [6] Sajal D, Eugene J M, Ritesh A. Science, 2015, 349: 726.

[7] [7] Wang B, Cancilla J C, Torrecilla J S, et al. Nano Lett., 2014, 14: 933.

[8] [8] Fei R X, Yang L. Appl. Phys. Lett., 2014, 105: 083120.

[9] [9] Khorasaninejad M, Walia J, Saini S S. Nanotech., 2012, 23: 275706.

[10] [10] Khajehpour J, Daoud W A, Williams T, et al. J Phys. Chem. C, 2011, 115: 22131.

[11] [11] Vladimir S, Takeshi S, Yoshiki S, et al. Appl. Phys. Lett., 2006, 89: 213113.

[12] [12] Chen Y Q, Peng B, Wang B. J Phys. Chem. C, 2007, 111: 5855.

[13] [13] Ghosh R, Pal A, Giri P K. J Raman Spec., 2015, 46: 624.

[14] [14] Khorasaninejad M, Adachi M M, Walia J, et al. Phys. Status Solidi A, 2012, 210: 373.

[15] [15] Duan Y, Kong J F, Shen W Z. J Raman Spec., 2012, 43: 756.

[16] [16] Wang R P, Zhou G W, Liu Y l, et al. Phys. Rev. B, 2000, 61: 16827.

[17] [17] Balkanski M, Wallis R F, Haro E. Phys. Rev. B, 1985, 28: 1928.

[18] [18] Bernard A W, Piermarini G J. Phys. Rev. B, 1975, 12: 1172.

[19] [19] Cerdeira F, Buchenauer C J, Fred H P, et al. Phys. Rev. B, 1972, 5: 580.

[20] [20] Craig R S, Pierre L, Anand D, et al. J. Non-Crystalline Solids, 2005, 351: 1653.

[21] [21] Su Z X, Sha J, Pan G W, et al. J. Phys. Chem. B, 2006, 110: 1229.

[22] [22] Irrera A, Artoni P, Iacona F, et al. Nanotech., 2012, 23: 075204.